What is CVE-2020-5537?

CVE-2020-5537 is a critical-severity vulnerability in Cybozu Desktop, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2020-05-25.

How severe is CVE-2020-5537?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Improper input validation in Cybozu Desktop

CVE-2020-5537

Cybozu Desktop for Windows 2.0.23 to 2.2.40 allows remote code execution via unspecified vectors.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2020-05-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.029 (86.6th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 86.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.029 · newest: 0.029 · change: 0.000

Affected products

Cybozu Desktop
Cybozu, Inc. Cybozu Desktop For Windows — versions 2.0.23 to 2.2.40

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

kb.cybozu.support/article/36329/ (Vendor Advisory)
jvn.jp/en/jp/JVN59552136/index.html (Third Party Advisory)
jvn.jp/en/jp/JVN59552136/index.html (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2020-5537?: CVE-2020-5537 is a critical-severity vulnerability in Cybozu Desktop, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2020-05-25.
How severe is CVE-2020-5537?: Critical severity. CVSS v3 base score is 9.8 out of 10.